GIRLSブラボー Romance15's

Yukinari Sasaki is an average high school student who was teased and bullied by girls to the point that he developed an allergic reaction, breaking out in hives whenever he comes into contact with a female. One day, when he returns home from school, he gets kicked into his bathtub by Kirie Kojima, his neighbor, and is transported to "Seiren", a mysterious world with a mostly female population

(from )